<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>09_绝对定位</title>
    <style>
        .fu {
            background-color: #ff0;
            position: relative;
        }

        .fu > div {
            width: 100px;
            height: 100px;
        }

        .z1 {
            background-color: red;
        }

        .z2 {
            background-color: green;
            position: absolute;
            right: 0px;
            top: 0px;
        }

        .z3 {
            background-color: blue;
        }
    </style>
</head>
<body>
<div class="box">
    <div class="fu">
        <div class="z1"></div>
        <div class="z2"></div>
        <div class="z3"></div>
    </div>
</div>
</body>
</html>